<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交审核"/>
    </el-steps>
  <el-button type="text" @click="addChapterBtn()">添加章节</el-button>
  <!-- 添加章节弹框 -->
  <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
          <el-form-item label="章节标题">
              <el-input v-model="chapter.title"/>
          </el-form-item>
          <el-form-item label="章节排序">
              <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
          </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
          <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
          <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
  </el-dialog>
  <!-- 添加小节弹框 -->
  <!-- 添加和修改课时表单 -->
  <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
    <el-form :model="video" label-width="120px">
      <el-form-item label="课时标题">
        <el-input v-model="video.title"/>
      </el-form-item>
      <el-form-item label="课时排序">
        <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
      </el-form-item>
      <el-form-item label="是否免费">
        <el-radio-group v-model="video.isFree">
          <el-radio :label="true">免费</el-radio>
          <el-radio :label="false">默认</el-radio>
        </el-radio-group>
      </el-form-item>
      <el-form-item label="上传视频">
        <el-upload
              :on-success="handleVodUploadSuccess"
              :on-remove="handleVodRemove"
              :before-remove="beforeVodRemove"
              :on-exceed="handleUploadExceed"
              :file-list="fileList"
              :action="BASE_API+'/eduvod/filevod/uploadVod'"
              :limit="1"
              class="upload-demo">
        <el-button size="small" type="primary">上传视频</el-button>
        <el-tooltip placement="right-end">
            <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
            <i class="el-icon-question"/>
        </el-tooltip>
        </el-upload>
    </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
      <el-button @click="exitBtn()">取 消</el-button>
      <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
    </div>
  </el-dialog>
  <!-- 章节 -->
  <ul class="chanpterList">
      <li
          v-for="chapter in chapterVideoList"
          :key="chapter.id">
          <p>
             {{ chapter.title }}
            <span class="acts">
                <el-button type="text" @click="openAddBox(chapter.id)">添加课时</el-button>
                <el-button style="" type="text" @click="openEditChpter(chapter.id)">编辑</el-button>
                <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
            </span>
          </p>
          <!-- 视频 -->
          <ul class="chanpterList videoList">
              <li
                  v-for="video in chapter.children"
                  :key="video.id">
                  <p>{{ video.title }}
                      <span class="acts">
                          <el-button type="text" @click="openEditBtn(video.id)">编辑</el-button>
                          <el-button type="text" @click="deleteVideo(video.id,video.title)">删除</el-button>
                      </span>
                  </p>
              </li>
          </ul>
      </li>
  </ul>
  <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
  </div>
</div>
</template>

<script>
import chapterApi from '@/api/edu/chapter'
import videoApi from '@/api/edu/video'
export default {
  
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      chapterVideoList:[], //章节小节列表
      courseId:'', // 课程ID
      dialogChapterFormVisible:false, //添加章节对话框是否可见
      chapter:{ // 章节对象
        title:'',
        sort:'',
        courseId:''
      },
      dialogVideoFormVisible:false,
      video:{ // 小节对象
          title: '',
          sort: 0,
          free: 0,
          videoSourceId:'',
          courseId:'',
          chapterId:'',
          videoOriginalName:''
      },
      saveVideoBtnDisabled:false,
      fileList:[], // 视频上传暂时存储的
      BASE_API:'http://localhost:9001/'
    }
  },

  created() {
    if(this.$route.params && this.$route.params.id){
       this.courseId = this.$route.params.id
       this.getChapterVideo()
    }
  },

  methods: {
    // =========================公共部分=================================
    previous() {
      this.$router.push({ path: '/course/info/'+this.courseId })
    },    
    next() {
      this.$router.push({ path: '/course/publish/'+this.courseId })
    },
    exitBtn(){
      if(this.video.videoSourceId){
        this.$message({
                      type: 'error',
                      message: "请删除当前的小节视频或是添加该小节"
                        })
                        console.log(this.video.videoSourceId)
      }else{
        this.dialogVideoFormVisible = false
        this.video = {}
      }
      
    },
    //==========================小节部分=================================
    // 添加小节
    addVideo(){
      this.video.courseId = this.courseId
      videoApi.addVideo(this.video)
      .then(response =>{
        // 关闭弹窗
        this.dialogVideoFormVisible = false
        // 提示信息
        this.$message({
                      type: 'success',
                      message: "保存成功"
                        })
        // 数据回显
        this.getChapterVideo()
      })
    },
    //视图上传多于一个视频
    // 上传超过一个视频之后调用此方法
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    // 成功回调
    // 小节视频上传成功之后的回调函数
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId
      this.video.videoOriginalName = response.data.originalFilename
    },
    // 移除上传的文件之前会调用此方法
    beforeVodRemove(file,fileList){
      return this.$confirm(`确定移除 ${file.name}？`)
    },
    // 移除上传文件之后的回调函数
    handleVodRemove(){
      videoApi.removeVideoFile(this.video.videoSourceId).then(res=>{
          this.video.videoSourceId = ''
          this.video.videoOriginalName =''
          this.fileList = []
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
      })
    },
    // 删除小节操作
    deleteVideo(videoId,videoTitle){
      this.$confirm('此操作将永久删除【'+videoTitle+'】小节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
             })
             .then(()=>{
                videoApi.deleteVideo(videoId).then(res=>{
                    this.$message({
                      type: 'success',
                      message: '删除成功!'
                    })
                    this.getChapterVideo()                 
                })
             })
             .catch(() => {
                 this.$message({
                     type: 'info',
                     message: '已取消删除'
                 });     
            });
    },
    updateVideo(){
      videoApi.updateVideo(this.video).then(response =>{
        if(response.data.success){
          // 关闭弹窗
          this.dialogVideoFormVisible = false
          // 提示信息
          this.$message({
                        type: 'success',
                        message: "修改成功"
                        })
          // 数据回显
          this.getChapterVideo()
        }
      })
    },
    // 添加或更新小节
    saveOrUpdateVideo(){
      if(this.video.id){
        this.updateVideo()
      }else{
        this.addVideo()
      }
      this.video = {}
    },
    // 打开修改小节对话框
    openEditBtn(videoId){
      this.dialogVideoFormVisible = true
      videoApi.getVideo(videoId).then(response =>{
        this.video = response.data.video       
      })
    },
    // 打开添加小节对话框
    openAddBox(chapterId){
      this.dialogVideoFormVisible = true
      
      this.video.chapterId = chapterId
      
    },

    //==========================章节部分=================================
    // 添加章节
    addChapter(){
      this.chapter.courseId = this.courseId
      chapterApi.addChapter(this.chapter).then(response=>{
        // 关闭弹窗
        this.dialogChapterFormVisible = false
        // 提示信息
        this.$message({
                      type: 'success',
                      message: "保存成功"
                        })
        // 数据回显
        this.getChapterVideo()
      })
    },
    // 打开修改章节对话框进行章节回显
    openEditChpter(chapterId){
      chapterApi.getChapter(chapterId).then(response =>{
        this.dialogChapterFormVisible =true
        this.chapter = response.data.chapter
      })
    },
    // 更新章节
    updateChapter(){
      chapterApi.updateChapter(this.chapter).then(response =>{
        // 关闭弹窗
        this.dialogChapterFormVisible = false
        // 提示信息
        this.$message({
                      type: 'success',
                      message: "修改成功"
                        })
        // 刷新章节列表
        this.getChapterVideo()
      })
    },
    // 根据章节ID删除章节
    removeChapter(chapterId){
      this.$confirm('此操作将永久删除该章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
             })
             .then(()=>{
                chapterApi.deleteChapter(chapterId).then(res=>{
                  if(res.success){
                    this.$message({
                      type: 'success',
                      message: '删除成功!'
                    })
                    this.getChapterVideo()
                  }else{
                    this.$message({
                      type: 'error',
                      message: '删除失败!因为该章节下还包含有小节！'
                    })
                  }
                })
             })
             .catch(() => {
                 this.$message({
                     type: 'info',
                     message: '已取消删除'
                 });     
            });
    },
    
    // 从后端接口获得章节小节集合
    getChapterVideo(){
      chapterApi.getChapterVideoList(this.courseId)
      .then(response =>{
        this.chapterVideoList = response.data.list
      })
    },
    // 根据chapter对象是否有ID属性值判断是添加还是修改
    saveOrUpdate(){
      if(this.chapter.id){
        this.updateChapter()
      }else{
        this.addChapter()
      }
      this.chapter = {}     
    },
    // 打开添加章节弹框
    addChapterBtn(){
      this.dialogChapterFormVisible = true
      this.chapter.title = ''
      this.chapter.sort = ''
    }
  }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>